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Originally Posted by doubleurx
I have a Vishnu stage 2 wrx. The set-up is great, but lately I've noticed the boost fluctuating between 12-15 psi at WOT in 3rd and 4th gears.
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Not sure what kind of boost controller the Vishnu is using, but it sounds like something is leaking vacume, or the boost controler is confused. Boost should be fairly constant in 3rd from 3500 RPM or lower to at least 5000 RPM I would think.